Mutual funds, the most legible way to get an estimate of the holding cost of securities (since they are required to transact at net asset value) routinely charge between 0.2-1% fees, depending on size and asset class.
Clearinghouses, transfer agents, and cash management firms don't work for free, which is the problem that cryptocurrencies explicitly solve; neither do compliance, KYC, fraud, etc., which most cryptocurrency protocols elide altogether.
Oh wait.. You don't want that functionality, and you're still using up the energy footprint in the event you are correct. One of these delivers significantly less versatility than the other for the same energy investment.